CN1172190C - High-speed, low-ripple peak-value detector - Google Patents
High-speed, low-ripple peak-value detector Download PDFInfo
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- CN1172190C CN1172190C CNB021467722A CN02146772A CN1172190C CN 1172190 C CN1172190 C CN 1172190C CN B021467722 A CNB021467722 A CN B021467722A CN 02146772 A CN02146772 A CN 02146772A CN 1172190 C CN1172190 C CN 1172190C
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Abstract
The present invention relates to a high-speed low-ripple peak detector which belongs to the technical fields of analogue signal processing, communication technology, and the signal detection of nuclear science. The present invention comprises the complete structure of a conventional peak detector, a transconductance amplifier or an amplifier which has differential input, resistors R1 and R2 used as biasing and a capacitor CB used as ac coupling, wherein one end of CB is simultaneously connected to the input end of the conventional peak detector and one end of the biasing resistor R1 whose the other end is connected with one end of the biasing resistor R2; the other end of the biasing resistor R2 is connected to the input end of the transconductance amplifier whose the other end is connected with the output end of the conventional peak detector. The present invention can simultaneously satisfy the requirements of low ripple and high speed and can be manufactured with the standard CMOS process. Meanwhile, the present invention can attenuate or amplify output peak signals and can output current signals according to requirements.
Description
Technical field
The invention belongs to the input field of analog signal processing, the communication technology and nuclear science, particularly be suitable for the peak detctor design of the input of wireless transceiver, audio/video analog signal processing circuit and nuclear science.
Background technology
Peak detctor is widely used in the signal deteching circuit of telecommunication circuit, audio/video analog signal processing and nuclear science, need peak detctor can export the peak value of input signal immediately according to input signal, this signal is given the control circuit of back level, control circuit obtains the intensity of current input signal according to the output of peak detctor, processes according to signal intensity then: the duty of feeding back or regulating other circuit.Require peak detctor can respond input signal fast and provide corresponding peaks.
In circuit design at a high speed, require peak detctor can reduce the output that the response time provides peak value; In telecommunication circuit, input signal is often smaller, so need peak detctor can export bigger value simultaneously.Because the signal of input is high-frequency signal often, so in traditional method, often have ripple in the peak value output, and the requirement of output is the ripple that does not need high frequency, so need suppress to ripple.
In order to consider that peak detctor can be integrated together with other circuit, particularly with the CMOS process compatible, so also require circuit enough CMOS technology to realize.
The peak detctor that traditional CMOS technology realizes, as shown in Figure 1: keep capacitor C s to constitute by a backfeed loop and sampling.Supply power Vdd, input signal are Vin, and control signal Reset carries out reset operation, output signal Vout to Cs.Concrete annexation is: input signal Vin is connected to the grid of metal-oxide-semiconductor M1A, and the source class of M1A and M1B all is connected on the current source IB1, and the drain electrode of M1A is connected in the drain electrode of M2B; The source class of M2B and the source class of M2A all are connected to ground, and the grid of M2B is connected with the grid of M2A, and and the drain electrode of M2A link together; The drain electrode of M2A is connected with the drain electrode of M1B; M1B grid be connected to output end vo ut.The grid of M3A is connected with drain electrode, and is connected with the drain electrode of M2B, and the source class of M3A and M3B all is connected to ground, and the grid of M3A and M3B joins, and the drain electrode of M3B keeps the end of capacitor C s to be connected with adopting, and while and the drain electrode of M7, the grid of M4 link together; The source class of M7 meets power supply Vdd, and the grid of M7 meets external control signal Reset; The other end of Cs is connected to power supply Vdd; The drain electrode of M4 is connected to power supply Vdd, and the end of its source class and current source IB2 is connected, and the other end of current source IB2 is connected to ground.
This circuit of Fig. 1 has formed the drain electrode of feedback loop: M1A, the grid of M3A, the grid of M3B, the drain electrode of M3B, the end of Cs, the grid of M4, the source class of M4, the grid of M1B, the source class of M1B, the drain and gate of M2A, the drain electrode of M2B, get back on the M1A, utilize this feedback loop to make Cs go up that impulse electricity is kept the Vout signal of output and the peak value of Vin equates.
If sampling keeps the capacitance of Cs to determine the peak value rise time t from high to low of output signal
HL, in High Speed System, the response time of peaking to detect is very short, such as 0.25 μ s, makes that like this appearance value of Cs is little; But the appearance value of Cs is too little, will make output go up and bigger ripple occur.Thereby must carry out the compromise consideration between response speed and the ripple.Yet under this result, the compromise result who considers can make that also the ripple on the output peak value still has about 1/10th of input signal, and still can not solve requirement at a high speed.
If in the twireless radio-frequency communication system,,,, often need peak signal is amplified in order to make late-class circuit to detect easily so the peak value of output is also less so the signal of input is generally less.In order to make the external control aspect, also usually requiring output is a current signal, and the circuit of Fig. 1 can only output voltage signal.
From last surface analysis as can be seen, traditional circuit has the following disadvantages:
The first, on the peak signal ripple is arranged, and in high-speed applications, ripple may be bigger, influences the readability of output signal;
The second, response speed is low;
Three, can not carry out easily output signal being decayed or amplifying
Four, can not output current signal.
Summary of the invention
The objective of the invention is for overcoming the weak point of prior art,, propose the peak detctor of a kind of high speed, low ripple, can satisfy low ripple and requirement at a high speed simultaneously based on traditional peak detctor structure; Can use simultaneously the CMOS technology preparation of standard.And the output peak signal can be decayed or amplify also output current signal as required.
The peak detctor of a kind of high speed that the present invention proposes, low ripple, the complete structure that comprises a conventional peak detecting device, it is characterized in that, also comprise a trsanscondutance amplifier or have amplifier, the resistance R 1 that is used as biasing and the R2 of difference input and as the capacitor C B of AC coupling; Its annexation is: the high-frequency signal Vin of outside input is input to the end of capacitance CB, and the other end of capacitance CB is connected to the input end of conventional peak detecting device and the end of the first biasing resistor R1 simultaneously; The other end of the first biasing resistor R1 links to each other with the end of the second biasing resistor R2, and link to each other with bias voltage VB simultaneously, the other end of the second biasing resistor R2 is connected to said trsanscondutance amplifier or has on the input end of amplifier of difference input, this trsanscondutance amplifier or another input end with amplifier of difference input link to each other with the output terminal of said conventional peak detecting device, this trsanscondutance amplifier or have the amplifier that difference imports and be output as voltage signal Vout or current signal Iout.
The another kind of high speed that the present invention proposes, the peak detctor of low ripple, the entire infrastructure that comprises above-mentioned first kind of peak detctor, it is characterized in that, also can comprise a low-pass filter, the input end of this low-pass filter links to each other with the output terminal of conventional peak detecting device, and its output terminal and said trsanscondutance amplifier or an input end with amplifier of difference input link to each other.
The design proposal of peak detctor of the present invention is compared with the traditional design scheme has following tangible advantage:
1) this peak detctor can satisfy low ripple and requirement at a high speed simultaneously;
2) can decay or amplify output signal;
3) can output current signal.
Description of drawings
Fig. 1 is traditional peak detector circuit figure.
Fig. 2 is first kind of structural drawing of the peak detctor of the present invention's proposition.
Fig. 3 is second kind of structural drawing of the peak detctor of the present invention's proposition.
Fig. 4 is the circuit diagram of peak detctor of the present invention.
Embodiment
The peak detctor that the present invention proposes reaches embodiment in conjunction with the accompanying drawings and is described in detail as follows:
First kind of structure of the peak detctor that the present invention proposes comprises structure, the trsanscondutance amplifier that conventional peak detecting device is complete or has amplifier, the resistance R 1 that is used as biasing and the R2 of difference input and as the capacitor C B of AC coupling as shown in Figure 2.External input signal is input high-frequency signal Vin, direct current biasing signal VB and supply voltage Vdd.Annexation is: external signal Vin is input to the end of capacitance CB, and the other end of CB is connected on the input pipe of traditional peak detctor, simultaneously CB this end also be connected with the end of biasing resistor R1.The other end of R1 is bias voltage VB, and VB also is added on the end of R2 simultaneously, and the other end of R2 is connected in the input of a trsanscondutance amplifier.Trsanscondutance amplifier is output as voltage signal Vout or current signal Iout.
Second kind of structure of the peak detctor that the present invention proposes comprises traditional peak detctor, low-pass filter, a trsanscondutance amplifier or has amplifier, the resistance R 1 that is used as biasing and the R2 of difference input and as the capacitor C B of AC coupling as shown in Figure 3.External input signal is input high-frequency signal Vin, direct current biasing signal VB and supply voltage Vdd.Annexation is: external signal Vin is input to the end of capacitance CB, and the other end of CB is connected on the input pipe of traditional peak detctor, simultaneously CB this end also be connected with the end of biasing resistor R1.The other end of R1 is bias voltage VB, and VB also is added on the end of R2 simultaneously, and the other end of R2 is connected in the input of a trsanscondutance amplifier.The output of traditional peak detctor is connected in the input of a low-pass filter, and the output of low-pass filter is connected in another input of trsanscondutance amplifier, and trsanscondutance amplifier is output as voltage signal Vout or current signal Iout.
The circuit embodiments of first kind of structure as shown in Figure 4, mainly comprises traditional peak detctor and trsanscondutance amplifier, specifically forms structure respectively as frame of broken lines I, II, and its annexation is described in detail as follows:
External signal Vin is input to the end of capacitance CB, and the other end of CB is connected on the grid of input pipe M1A of traditional peak detctor, simultaneously CB this end also be connected with the end of biasing resistor R1.The other end of R1 is bias voltage VB, and VB also is added on the end of R2 simultaneously, and the other end of R2 is connected on the grid of M5A of a trsanscondutance amplifier.The drain electrode of M5A is connected in the drain electrode of M4A, and this node can be used as output voltage V out.The grid of M4A, the grid of M4B and drain electrode link together, and the source class of M4A and M4B is connected to ground.The drain electrode of M4A is connected with the drain electrode of M5B, and the grid of M5B is the other end of R2, and the source class of M5B and the source class of M5A are connected to the end of current source IB3.The other end of IB3 is connected with supply voltage.The drain terminal of M4A is connected with the grid of M6, and the source class of M6 is connected to supply voltage, the drain terminal output current Iout of M6.
Owing to a lot of kind that implements of low-pass filter, trsanscondutance amplifier also has a lot of kinds with the voltage amplifier with difference input simultaneously, does not exemplify circuit one by one and is described.
Principle of work of the present invention: as Fig. 2 or Fig. 3, in order to suppress the ripple from traditional peak detctor output signal, utilizing trsanscondutance amplifier in fact also is a firstorder filter, its bandwidth is set to the frequency of the response time correspondence of a requirement, so just can suppresses the ripple that produces by high-frequency input signal.Frequency such as high-frequency signal is 375MHz, and the requirement of response time is 0.25 μ s, so the rejection ratio that produces owing to trsanscondutance amplifier can reach 20dB, thereby ripple effectively makes an output signal peak value display signal.The ratio of bigger if desired inhibition high-frequency signal can adopt a low-pass filter to suppress ripple separately as shown in Figure 3 so, and then use trsanscondutance amplifier to amplify.
As Fig. 2 or Fig. 3, owing to include DC component in the output signal of traditional peak detctor, need deduct this DC component, the peak value of " purely " is amplified.In fact because feedback loop (source class of the end of the grid of the drain electrode of M1A, the grid of M3A, M3B, the drain electrode of M3B, Cs, the grid of M4, M4, the grid of M1B, the source class of M1B, the drain and gate of M2A, the drain electrode of M2B, get back to M1A) existence, DC component in the output signal equals the bias voltage VB of input signal, so adopt one just can carry out peak value is amplified with the differential transconductance of biasing or voltage amplifier with difference input.
If requiring output signal is voltage signal, directly use the drain terminal of the metal-oxide-semiconductor M4A among Fig. 4 just passable; If requiring output signal is current signal, can use a metal-oxide-semiconductor M6 to come voltage signal is converted into current signal output.
Each component parameter is as shown in table 1 in the present embodiment:
Table 1
| MOS device size (um) (W, L) | Resistance sizes (Ω) | |||||||
| ?M1A ?M1B | ?M2A ?M2B | ?M3A ?M3B | ?M4A ?M4B | ?M5A ?M5B | ?M4 | ?M5 | ?M6 | ?R1 ?R2 |
| ?20 | ?10 | ?5 | ?80 | ?10 | ?20 | ?7.5 | ?10 | ?50K |
| ?0.35 | ?0.35 | ?0.35 | ?0.35 | ?0.35 | ?0.35 | ?1 | ?1 | |
Bias current and the bias voltage parameter used are as shown in table 2:
Table 2
| Bias current (μ A) | Bias voltage (V) | ||
| ?IB1 | ?IB2 | ?IB3 | ?VB |
| ?800 | ?200 | ?200 | ?1 |
Claims (2)
1, the peak detctor of a kind of high speed, low ripple, the complete structure that comprises a conventional peak detecting device, it is characterized in that, also comprise a trsanscondutance amplifier or have difference input amplifier, be used as the resistance (R1 and R2) of biasing and as the electric capacity (CB) of AC coupling; Its annexation is: the high-frequency signal (Vin) of outside input is input to an end of capacitance (CB), and the other end of capacitance (CB) is connected to the input end of conventional peak detecting device and an end of first biasing resistor (R1) simultaneously; The other end of first biasing resistor (R1) links to each other with an end of second biasing resistor (R2), and link to each other with bias voltage (VB) simultaneously, the other end of second biasing resistor (R2) is connected to said trsanscondutance amplifier or has on the input end of amplifier of difference input, this trsanscondutance amplifier or another input end with amplifier of difference input link to each other with the output terminal of said conventional peak detecting device, this trsanscondutance amplifier or have the amplifier that difference imports and be output as voltage signal (Vout) or current signal (Iout).
2, the peak detctor of high speed as claimed in claim 1, low ripple, it is characterized in that, also comprise a low-pass filter, the input end of this low-pass filter links to each other with the output terminal of conventional peak detecting device, and its output terminal and said trsanscondutance amplifier or an input end with amplifier of difference input link to each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021467722A CN1172190C (en) | 2002-11-08 | 2002-11-08 | High-speed, low-ripple peak-value detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021467722A CN1172190C (en) | 2002-11-08 | 2002-11-08 | High-speed, low-ripple peak-value detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1405567A CN1405567A (en) | 2003-03-26 |
| CN1172190C true CN1172190C (en) | 2004-10-20 |
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| Application Number | Title | Priority Date | Filing Date |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105182049A (en) * | 2015-09-16 | 2015-12-23 | 湖南格兰德芯微电子有限公司 | Radio frequency signal peak detector |
| CN107783062B (en) * | 2017-11-27 | 2024-03-12 | 厦门亿联网络技术股份有限公司 | Ripple detection device |
| CN110286259B (en) * | 2019-07-12 | 2021-10-08 | 浙江匠联科技有限公司 | Current peak value detection circuit |
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2002
- 2002-11-08 CN CNB021467722A patent/CN1172190C/en not_active Expired - Fee Related
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Granted publication date: 20041020 Termination date: 20121108 |